The best cam I've found for "low" compression 400 builds with mostly stock drivetrain is the Crower 60240. 210/222/112 LSA. It makes around 12" vacuum at 700-750rpms. Strong power off idle and in the normal driving range. You don't need a stall converter or tall rear gearing.
The Crower 60916 is better suited for higher compression builds and at least 3.42 gears with a manual trans or 2400-3000rpm converter. It makes great power in a 400 build but too "soft" off idle and low RPM's for the kind of build you are doing......IMHO.....
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73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),
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